Tube-painting machine



May l5, 1923:

P. BELLOWS TUBE PAINTING MACHINE Filed Feb. 3, 1921 '7 Sheets-Sheet lv INVENTOR PHILIP BEL LOW/5.

lu |11 l If P. BELLOWS vTUBE PAINTING MACHINE Filed Feb. 3, 1921 7 Sheets-Sheet 2 INVENTOR P'HILI F BLLWS.

BY ry/f i; ab:

P, BELLOWS TUBE PAlNTING MACHINE 1921 7 Sheets-Sheet 5 DH/UP BEL On/5.

Eiled Feb. 5

EASSM May l5, 1923;

P. BELLOWS TUBE PAINTING MACHINE '7 Shets-Sheet 4 File Feb. s, 1921 INVENTOR PH L! F' BELLOvV.

awa/@dm May 15, 1923. 1 ,455965 P. BELLm/vs TUBE PAINTING MACHINE Filed Feb, s, 1921 7 sheets-sheet 5 annuo 000011 lu n aoouuun Q INVENTUR HIL/P BELLUW. 15V-759mm Www/wf ATTORNE' '7 Sheets-Sheet '7 Filed Feb. s, 1921 P BELLWS TUBE PAINTING mmm@ May E5, 1923.

v WWA/ron PHIL IF? BELLOI/V.

Patented May 15, 1923.

narran S'raras ,satte le aar PHILIP nELL'ows, or EoSToN, MASSACHUSETTS, AssIeNon To. DAMPNE'Y contraria ,0E AMERICA, 0F BOSTON, MASSACHUSETTS, a CORPORATION or' MASSACHUSETTS.

TUBELPAINTING MACHINE.

Application led February 3, 1921. 'Serial No. 442,098.

To all wlwm it may concern."

-. Be it known that I, PHILIP Bnnnows, a4

subjectief the King of Great Britain and Ireland and the Isle of Man, having declared my intention of becoming a citizen of the United States, residing in Boston, Massachusetts, have invented Tube-Painting Machines, of which thepfollowing is a specification. y

In-order to preserve the tubes of boilers of a certain type as well as to prevent'in a greater or less degree the accumulation of scale, soot or injurious substances .upon their inner surfaces it is advisable to apply to such surfaces a coating of protective paint, and one object of this invention is to 'provide a practical, convenient and elicient machine for applying to and distributing paint on the interior surfaces of tubular structures, more especially to the inner surfaces ofboiler tubes; the invention further contemplating means whereby the drying of thel painted surfaces may be hastened.

A further object of my invention is to provide a painting machine of the above noted class with novel means whereby it may be suitably supported in position to operate on a series of substantially parallel tubes, the arrangement and construction of the parts being such as to facilitate the quick and convenient` mounting of the mechanism on and,

its removal from such tubes regardless of their number, arrangement and dimensions.

I also desire to provide novel mechanism for insuring the rapid and thorough'application of a coating of paint to and its distril bution upon the inner surface of a tubular structure, and the invention includes novel means for not only delivering paint at a definite rate in predetermined amounts, but also for repeatedly brushing such paint over the surface to which it is t'o be applied in a manner simulatingthat characterizing hand painting. Y

Another object of my invention is to provide a simple and compact mechanism for 'forcibly delivering paint from a source of supply o the same to the interior surface of a cylindrical structure so that it may be 'subsequently spread by suitably actuated brushes.

It is also desired to provide a tube painting machine having paint applying and distributing elements advanced by a suitable step reciprocation through the Structure to be. painted, together with a dcvice for utilizing such movement of the parts for the operation of paint delivering and distributing devices.

I further desire to provide a relatively simple, compact and reliable mechanism for reciprocating a paint applyingand distributing device Within a tubularstructure and at the same time-advancing it through said structure at a rate suitable for the proper application of the paint, the arrangement of parts being such as to automatically maintain a suitable tension on the member or ele- ;nent for moving the paint applying apparaus. v

These objects and other advantageous ends l attain as hereinafter set forth, reference being had to the accompanying drawings, in which:

Figure l, is a front elevation of a tubular boiler showing my invention as applied thereto; A y

Fig. 2, is a side elevationof'the apparatus shown in Fig. 1, the' boiler and a portion of said apparatus being shown in vertical section;

v Fig. 3, is a vertical section on the line 3 3, Fig. l, and on a larger scale than Fig. 2, illustrating the actuating mechanism `for the propelling chain;

Fig. 4, is an elevation of the rear .end of the boiler shown in Fig. 5, showing certain portions of myV invention as applied thereto;

Fig. 5, is a vertical section .on the line 5 5, Fig. 4;

F ig. 6, is a plan, partly in section, of the mechanism constituting my invention, showing in horizontal section the boiler to which said invention is applied; v

Fig; 7, is' a side elevation, partly in section, of the paint applying and distributing mechanism, showing it in an operative position in a boiler tube;

Fig. 8, is a plan oi the mechanism shown in Fig. 7,' the boiler tube as before being shown in section;

Fig. 9, is a vertical section on the line Fig. 10, is a fragmentary horizontal section on the line 10-10, Fig. 9;

Fig. 11, is' an inverted elevation of a portion of the mechanism shown in Fig. 7, illustrating the side thereof opposite that illustrated insaid Fig;

Figs. 12, 13 and 14, are vertical sections on the lines 12-12, 13-.-13, and 14-14, Fig, 10;

Fifi 5 is a 'vertical sectionon the line 'A15-i415, Fig; 7;

Fig. 16, is a side elevation of the structure constltuting the paint reservoir;

Figs. 17 and 18, are vertical sections on the lines 17--17 and 18-18, Fig. 16; A y Figs. 19 and 20, are fragmentary eleva- Fig. 25, 1s a longitudinal vertical section of thel device for supplying paint to the reservoir of m apparatus;

Figs. 26 an 27, are respectively a plan and a vertical section on the line 27-27, Fig.

26, illustrating the preferred form ofyieldingi coupling for one of the propelling chains, an 1 Figs. 28 and 29, are respectively a side elevationfand a -plan of a special feature of my invention.

In Figs. 1 to 6 o f .the above drawings, 1 represents the cylindrical body or shell of a tubular boiler having a front head 2, a rear head I3, and a series of tubes'4 having their ends respectively mounted in said heads. v In accordance with my invention, I provide-two supporting Aframes, preferably, though not necessarily, carried by the front and rear heads respectively, 'and of these frames the first consists inl the present-instance 'of a casting hav-ing a bottom horizontal member 5, a vertical member 6 and a top horizontal member 7. Each of the members 5 and 7 is connected at one end to and extends at lright angles from the member 6, the opposite end being more or less frusto-conical in form and of such dimensions as to fit into the open end of one of the tubes 4 of the boiler. ,i p

A collapsible gripping device is provided i for removably holding these end portions 8- in 4place against the ends of' the tubes, and in Fig. 3 I have illustrated a preferred form of this device Whichconsists of a pair of blocks blocks have their adjacent 'p faces o positely inclined for coaction with a slidab e 'wedge member-1 1 mounted .on a threaded rod 12 passing through the head 8v and having its outer end 13 headed to be turned by hand or by a wrench for the purpose of drawing said wedge forcibly between the blocks ,9 so as to spread'and retain themin grlppin engagement with the inner vsurfaces o the' shelf 5l is preferably provided" at its outer l ed e with a rearward arm 5 adapted similar to the member 5 to it the end of one of t e boiler tubes and therebyto constitute an additional support for the said shelf.

The front framework of my device also.v

includes a suitable number of frame members 14 similar to the member 5-6-7, with the exception that theextension ais eliminated, the arms 14a and 14" being provided y with heads 8 carrying tube gripping devices similar to that shown in Fig. 3 whereby they -90 maybe rigidly connected to the boiler structure. In the present instance the member 14 and the frame member 5-46--7 are constructed to removably receive and be rigidly connected by a pair of parallel bars 15 andv 16 in the form of tubular members which engage said frame member at the outer ends of its top and bottom portions.

.If desired, I may also provide supporting orbracing elements 17 each in the form of an arm engaging the lower bar 16 and extending therefrom downwardly and inwardly so as to be ca able of entering and being supported by-tiie end of one of the lower boiler tubes, though ,in some cases it ma theyadjacent boiler head, so as to assist in supporting theweight' of the remainder of the frame. The tubular supporting bars 15 and 16 may be rigidly .connected to the frame members by any suitable means such as set screws 18 (Fig. 3). p.

The frame members 5-6-7 and 14 promerely rest against'the outer face of icov vide bearings, preferably in their vertical portions, for a substantially horizontal shaft 19 on which `are 4rotatably carried one or an `desired number of chain or sprocket whee s `,20 whose pitch diameter is su bstantis\1ly'` equal to the distance between the center.

lines of a pair of adjacent boiler` tubes in the same vertical plane. l r

At the back end of the boiler I provide av sists of a suitable' number of supporting v 7 brackets 21, each having a bottom member 9 connected to the heads8 by rods 10. These a 22, .an upright member 23 andl a top member 24. These' two brackets 21 are connected by lower andupper horizontal'bars 25 and lsecond frame structure-which in general isf -I similar to that at the 'front end and con# 26, in the presentinstance made of tubular sections, and as before I an inclinedbracing mem r or mem ers 27 xed to the bottom member 25 in position to 'extend inwardly at an angle so as to transmit a certain part of the downward thrust on the frame to the boiler head. This member may project into and restl upon the projecting end of one of the lower boiler tubes.

In this case the bottom member 22 of the frame is lixed. to thel bottom horizontal bar 25 independently of the upright bar 23 and carries at its inner end a guide block 28 connected through a bolt 29 to a disc 30 within the boilertube so as to center and properly support it. The upright members 23 ofthe brackets 21 provide bearings for a horizontally extending shaft 3.1 on which are rotatably mounted sprocket wheels 32 of the same construction and dimensions as the sprocket 20 at the front of theboiler, and both sets 'of sprocket wheels are laterally positioned on their supporting shafts 19 and v 31 by sleeves or collars 33'thereon.

ln order to maintain ahsuitable tension on the Vsprocket chains 34 which extend around the coacting sprocket wheels 20 and 32 of each bar, the upright member 2 3 of each of the rear brackets is freeto swing -on its supporting bar 25 and each of the bracket members 24 is connected to the top horizontal bar 26 so as to be free to turn thereon. Each ot these members 24 has slidably mounted in it a bolt 29a for holding and positioning its guideblock 28 and its centering disc 30 in the boiler tube. A spring 35 is mounted on said bolt between the block 28 and said member 24 as'indicated in Fig. 5.

if desired or found necessary to further increase the tension on the chains 34, a second bracket member 24a may be rotatably mounted on the shaft 31 and formed for sliding engagement with a bolt29", which,

as in the case of the bracket .member 24,.

carries a coil spring 35 and is supported by av guide block 28 and a centering disc 30.

As a result -of the above construction and arrangement of parts 1 am enabled to support a number of endless chains 34.each with its two main portions or substantially horizontal runs extending parallel and substantially centrally throu h a pair of the boiler tubes and maintain t ese chains at a predetermined constant tension, dependent on the number, design and arrangement of the springs 35. .1 Within the tubes 4 through which the chains extend I connect to each chain 34, referably between its ends, a paint suppl mg and distributing apparatus hereafter described, and for movin said chains with said apparatus longitu inally through the tubes in the manner which I have found to most thoroughly and eiiioiently apply thel peferably' rovide paint, I provide the actuating mechanism shown in detail in Figs 1, 3 and`6.

The mechanism inl the present instance consists of'a pair of ratchet wheels 36 and 37 Vhaving their teeth inclined in opposite directions and both fixed to the front or driving shaft 19. 'llhe diameters of said ,ratchet wheels are different in the present instance, one bein substantially twice the diameter of the oler and having substantially twice the number of teeth. The' ratchet wheel 36 has a pawl 38 cooperating with its teeth and carried on an arm 39 pivotally mounted `on a second arm 40 fixed to and projectin from the bottom supporting bar 16. Simllarly the ratchet Wheel 37 has a `coacting` pawl 41- carried on an arm 42 -pivoted to a second arm 43, likewise xed to the bar .16. Mounted in suitable bearingsin the bracket 5b is a shaft 45a havingl at one end a gear wheel 45, said ear wheel having a crank pin 44 with whic the pawl arm 42 is connected by means of an arm 42a anda bell crank lever 42h, which latter is pivotally secured to the said arm 42. At the end of the shaft 45a opposite the gear wheel 45 is a crank yarm 45", to which is pivotally attached a connecting rod 39a, the other end of which is pivotally secured to a bell crank lever 39b pivotally secured to the arm 39. rlihebell crank levers 42bl and 39b are respectively connected by means of arms 42 and 39c to the pawls 41 and 38, and the movements of the said arms 42c and 39c relative to the arms 42 and 39 respectively being limited by pins 42d and 39d which extend from the respective arms through slots in the rods 42c and 39, while springs 411'and 38EL are provided which normally retain the said pawls 41 and 38 in the downward ratchetengagin position. Continuous rotation of the said s aft 45a is ed'ected by means of the motor 46 which, through a suitable train of gears, is operatively connected with the said shaft.

The various parts are so arranged that whenthe motor is in operation` the rotation of the gear wheel 45'causes the pawls 38 and 41 to alternately engage and move their coacting ratchet wheels, with the result that the shaft 19 is turned in a counter-clockwise direction through a definite angle by the movement imparted tothe' ratchet wheel 37- turnedv Dit Mil)

' whereby when the distributing element has reached the forward end of the tube through which it is being drawn, the switch is automatically thrown open b engagement therewith of the said block 4 and 'the operation of the motor discontinued.

The apparatus so far described will be seen to consist of a pair of frame structures so made as tobe conveniently secured to or removed from the front and rear heads re- .spectively of a tubular boiler and to include pairs of sprocket wheels so positioned and proportioned as to each support an endless chain so that its runs may extend substantially axially through two parallel tubes to be painted. Each of these chains under operating conditions is maintained under a definite required tension and it is driven by a series of power impulses causing it' to move alternately in opposite directions, but for different dlstances so that in addition to being reciprocated it is caused to advance through the tubes.

For supplying paint to the tubes and distributing it on their inner surfaces, ll provide the apparatus whose detail construction. is illustrated in Figs. 7 to 24 inclusive. This includes a paint container or reservoir of a generally cylindrical outline whose diameter is such as to permitvit to freely enter any of the tubes to be painted. One end of this container is formed by a head 51 from which a bearing stud 52 projects axially of said container, and terminates in a I hook 53 lfor convenient connection to one end of a chain 34. The opposite end of the paint reservoir is formed with an 'elongated tubular extension 54 connected to its interior v by an intake tube 55 which projects downwardly towithin a short distance of its lowest point. The op osite end of the extension 54 hasmounte on it a pump casing 56 having a bearing extension in line with the extension 54 and the bearing stud 52? This extension 57 is tubular and has fixed in its extremity a head terminating in a second hook 58 for engagement with the second end of one of the propelling chains 34.

. The'head 51 of the paint reservoir is rovided with an inlet opening controlle by an inwardly opening check' valve 59 mounted in a bushing 60 formed Ato cooperate with the nozzle61 of a filling gun 62, (Fig 25). Said reservoir has also at its uppermost por` tion a normally closed air escape'valve 63,1

(Fig. 21) whereby as the reservoir is filled the air trapped` therein' may escape. The extension 54 of the paint reservoir is externally formed to provide .a support for a reciprocatory cylindrical brush 64, and a second and similar cylindrical reciprocatory brush 66 is slidably mounted on the bearing stud 52, the arrangement being such that said brushes are shorter than the structures on which they slide and tend to remain in given positions longitudinally of a boiler tube, which are alternately moved in opposite directions by reason of their engagement with the structures adjacent their ends and the range of movement of the brush 66 is greater than that of the brush 64. rl`hese brushes while they may be of any suitable construction for applying and properly distributing paint to the inner cylindrical surface of the tube in which they operate, are each preferably made of two semi-annular bristle-supporting body sections 68, (Figs. 23 and 24) normally pressed apart `by springs 69 so that all of their bristles are constantly maintained in engagement with the inner tube surface. These body sec' ions are mounted between the flanges of a sleeve 68 and are retained in position while allowed a limited radial movement by screws 68b rojecting from the flanges into slots in tieir ends. The brushes are held from rotating on their structures 52 and 54 by rods 65 projecting from the paint reservoir structure 50 and slidable 'through slots in the fianges of the sleeves 68, (Figs. 15 and 16).

`The passage within the tubular extension 54 for the paint reservoir, while communicating with the latter at one end, at its opposite end is connected through a passage 70, (Fig. 9) with the upper portion ot' a cvlindrical cavity 71 in the pump casing This cavity has operative in ita )luuger T2 acted on by a spring 7 3 so that 1t tends to remain in and return to its outer position' in said cavity, from which a passage 74 leads into the bearing extension 57, past a check valve 75 and through one or more outlets 76 into a chamber 77 within the paint distributor 78. This is rotatably mounted on said extension 57 and in the present case consists of a flat cylindrical .structure having radially extending passages 79 Whose inner INU ends open into its cavity 77, so that liquid f it a sprocket wheel 80 concentric-with the.

bearing structure '57 and provide means whereby it is rotated by 'the reciprocation of the paint delivering and distributing'y unit on a screw 82, (Fig. carrying a' spring Athat its two supported linger 83 positioned to engage the teetlrof the sprocket wheel 8O and toimpart to saidsprocket wheel a rotary motion while the mechanism is operating. The arm 81 under the action of a spring 84 tends to re,-`

main in one of its extreme positions in engagement with a stop 85. (Big. 7 and for the purpose of periodically swinging it on its pivot away from said stop to its other extreme position I mount on it a roller 86 in position to be engaged by of a rod 87 slidably guided in a suitable bearinglug on the paint reservoir structure 50.

The headed end `ot this rod extends through the brush structure 64 and is supported by that tlangc thereof nearest the pump, having on it a spring 89 confined between said flange and a collar 88 in such manner as to tend to keep the head 90 against the ange. The opposite 'end of the rod 87 projects beyond the reservoir structure 50 in position to be actedon'by the second paint brush' 66, as said reservoir with its associated parts moves in one direction relatively to said brush.

if it is desired to apply a coating of paint to the tubes of a boilerthe Jfront and rear frame structures are suitably mounted on the front and rear headsof the boiler, as shown in Figures 1 to 6 inclusive, by properly inserting and expanding the various sets of gripping devices Aas previously explained. The parts are so positioned that each ot the sprocket wheels 32 carried by the front trame are in the same vertical plane as a similar sprocket wheel carried by' the rearra-me and will support a chain 3a so arallel runs extend substantially in the ine of the axis of two boiler tubes. v

The paint reservoir 50 of a paint applying and distributing unit -is then illed with paint referably from a filling gun such as that il ustrated in Fig. 25, and such unit is then introduced into one of said boiler tubes with. its hooked'ends 53 and 58 connected to the ends of one of the chains 34. Under the action ofthe tension springs 35 the arms 23 and with them the sprockets 32 which they carry are swung outwardly away from 'the -rear head 3 of the boiler, maintaining such a tension on the two runs of the chainl 34 as will at all times take up any lost motion and maintain said runs substantiall axial of the boiler tubes 4 through whic they extend. A H now the electric motor 46 be put in operation, the shaft 19` through the two sets of ratchet mechanism is alternately rotated in opposite directions but through unequal an les so that the upper run of the chain and hence of the paint distributing unit atthe head 90 4tached thereto is first moved `a distance of,

for example, three inches into the boiler tube in which it is inserted and is then moved .two inches more or lessin the opposite direction. As a consequence said unit is gradually advanced through the boiler tube from one end to the other.

Referring to Figures 7 to 9, it will be noted that if the painting unit be first moved toward the lett for example, the aint brushes 64: and 66 owing to the frictional' engagement of their bristles with the boiler tube, lag behind until the first ot them is engaged by the adjacent end of the paint reser` voir 50 and the second brush is engaged by the flange of the hook 53, after whichl both brushes move with the'unit toward the left.

H now the direction of movement of the painting unit be reversed, the two brushes again remain stationary until the vbrush 64 comes into engagementwith the head 91, whereupon this latter is moved longitudinally in its guideway in the pump structure 56 against the action of the spring 91-L and through the arms 92 and 93 forces the pump plunger 72 into its cylinder. Following this, the spring supported pawl 83 is moved into the plane of the sprocket wheel 80 of the paint distributing member 78, the second brush 66 striking the adjacent end of the rod 87 and moving this against the action of the spring 89 so that its head 90, acting on the roller 86, turns on its pivot 82 the arm which carries the pawl 83. The latter is thereupon brought into engagement with the -teeth of the sprocket wheel 80 and causes this to make a partial revolution' in one direction, thus rotating the distributing member 78, and causing the contained'material to be thrown out against the tube walls After the direction of movement of the paint. unit has'been again reversed, the disengagement of the head 90 from the brush 64 permits the spring 71to raise the pump `plunger 72 or move it outwardly in its cylits upper or normal position at the sametime the relative movement ofthe various parts .permits the spring 89 to move the rod 87'tothe psition shown in'Fig. 7, with its head 90 in engagement with thev adjacent' y flange of the brush 64.

Obviously the re eated movement of the Y paint unit 1n opposite directions and the resulting reciproc'ation of the pump plunger l 72 causes paint to be drawn from the reservoir 50 through the pipe '55 and tubular structure 54 into the cylinder from which it is forced throughA the passage 74 'into the lao l distributing memberI 78. -The above vdescribed relative movement of the brushes and, consequent turning of the member 7 causes the streams of paint discharged into the passages Z9 to be delivered upon the inner surfacejo'f the -boiler tube in helical lines, lit beingobvious that the number of these discharge openings 79 may be varied so that paint may be distributed for at least the full circumference of the circular tube section'.I A

' 'As will be understood from the above descriptiomthe paint unit shown in Figs. 7 `to 9 for example, is designed to advance to- Ward the left so that after the paint h as been applied by the member 78 in a series of more or less helical lines to the inner surface of the boiler tube, it is engaged first by the brush 64:, which moving back and forth spreads it 1n -a ilm more or less completely over the inner surface of said tube. This partially spread paintr is thereafter engaged by the brush 66 and is still further spread or distributed so that it takes the form of a Well brushed, evenly distributed coat. When the paint applying and distributing unit has moved from one end of the tube to the other and has coated its interior surface as above described, the motor is stopped and Without disconnecting from the upper run of the chain 34:, it is preferably drawnback through the tube by the rear chain, the front chain hook having been disconnected. lin this way, any mark left on bottom of tube by the chain inpassing through is eliminated. The mechanism al- Ways Works in one direction only. It is al- Wabys started from the same end ,of the tu e.

Obviously While i may employ but a single painting unit, if desired any suitable number of units may be actuated from the shaft 19 at the same time, and after the application of paint to allof the tubes of one set, thev position of the front and rear supporting rames may be altered so that the two runs of the chain or chains 34 may be extended throu h two other tubes. The paint unit may t en be put in operation as above described to coat another tube.

It it be desired to hasten the drying of the paint or coating applied to the tubes, I may connect to the electric motor 46 a suitable tanor blower 100, and from this run an air delivery Apipe 101 having outlets arranged to discharge into one or more tubes after they have been painted, it being understood that the conduit or pipe 101 is preferably flexible so'as to be easily adapted to deliver air to any or a number of the boiler tubes after these have been painted;

claim:

1. In a tube coating machine, apparatus apted to pass through a tube and comprisg' mechanism operatwe by its movement in the tube for distributing a coating material over the surface thereof; and mechanical means for reciprocating .said apparatus Within the tube.

2'. In a tube coating machine, apparatus, adapted to be p assed through a tube and, comprising mechanism operative by move;

ment of the apparatus inthe tube fonde,-

positing a coatmg material uponthe tube surface; means for spreading the materia-1 over said surface; and mechanism for reciprocating the apparatus within the tube by a succession of opposite movements, of Which those in one direction are greater than those in the opposite direction.

3. In a tube coating machine, apparatus adapted to be passed through a tube and comprising, in combinatiomdepositing mechanism, and an element capable of movement relative to said mechanism and adapted to frictionally engage the Walls of the tube thereby to be rendered relatively immovable, said element being' operatively connected with said mechanism whereby the latter is actuated when the structure is moved in the tube.

' 4. In a tube coating machine, apparatus adapted to be passed through a tube and comprising, in combination, a container, depositing mechanism, means for delivering coating material from the said container to the depositing mechanism, and means for actuating said depositing mechanism.

In a tube coating machine, apparatus adapted to be passed through a tube and comprising, in combination, a container, Y

depositing mechanism, a duct extending from the container to the depositing mechanism, and a pump for forcing coating material through said duct from the container to the depositing mechanism.

6. In a tube coating machine, apparatus adapted to be passed through a tube and comprising, lin combination, a container, mechanism for pumping a coating materiai from the container and depositing it yon the surface of the tube, a brush adapted to distribute the said coating material overthe surface; and means for reciprocating the apparatus in the tube.

7. In a tube 'coating machine, apparatus adapted `to be passed through a tube and comprising, in combination, a container, a rotary depositing element, means for delivering coating material from the container to the depositing element, and mechanism for rotating said element.

Sti

ica

Till@ rae 8. In a tube coating machine, apparatus incense said brush immovable, and mechanism actu-`- erating saidv depositing element.

9. In a tube coating machine, apparatus adapted to be'passed through a tube andA comprising, in combination, a container, a brush capable of limited movement with respectto said container and adapted to frictionally engage the walls of said tube, said friction tending to ret'ain said brush immov-y able when the apparatus is moved in the tube, and mechanism actuated by engagement with said brush forwithdrawing a coating material from the. container anddepositing it upon t-he walls of said tube.

10. In a tube coating machine, apparatus adapted to beV passed through a tube and comprising, in combination, a container for a coating` material, a pair of brushes capable of limited movement relative to said mechanism for rotating said depositing element, and means whereby said pump and element-rotating mechanisms are respectively actuated by contact with said brushes.

11. In a tube coating machine. apparat-us adapted to be passed through a tube and comprising, in combination, a container, a brush, mechanism whereby a coating material is withdrawn from said container and deposited upon the walls of said tube in advance of said brush;l and mechanism for bodily moving the container and. brush longitudinally through the tube.

12. In a tube coating machine, apparatus adapted to be passed through a tube and comprising, in combination, a container for coating material, means for reciprocating said container in the tube, and. mechanism whereby at each reciprocation of the container in the tube the coat-ing material is drawn therefrom and deposited upon the walls of said tube.

13. In a tube coating machine` apparatus adapted to be 4passed through a tube, and mechanism for passing said apparatus through the tube in a series of reciprocations in which the forward travel is greater than the rearward, said apparatus comprising a container for coating material, mechanism operable at each rearward tra-vel of the apparatus whereby a portion of said coating material is drawn from said container and deposited upon the walls of the tube. and means operable upon each forward -travel of the apparatus for spreading the said depositedmaterial over the said surface.

`meclianism for advancing sai 14. In a tube coating machine, apparatus adapted to be passed throu h a tube, apparatus through a tube ina series of reciprocations in which the forward movement is greater than the rearward, saidy apparatus comprisingl a container, a brush capable of limited moveinent with respect to said container and adapted to frictionally engage the walls of 'the tube, said engagement tending to retain the brush immovable when the apparatus is moved in the tube, and depositing mechanism mounted in advance of sa'id brush and adapted to be actuated by'contac* with said brush at each rearward movement of the apparatus in the tube.

15. In a tube coating machine, apparatus adapted to be passed through a tube and com rising, in combination, a container, a brus capable of limited movement relative to said container and adapted to frictionally engage the walls of the tube, said frictional engagement tending to retain the brush' immovable when the' apparatus is moved in the tube, a rotary depositing element, means for discharging a coating material from the .container'into the depositing element, a ratchet wheel connected with said element, a pivotally mounted pawl, and an operating rod Vfor said pawl adapted to be actuated by contact with said brush when the apparatus is moved in the tube.

16. In a tube coating machine, apparatus adapted to be passed through a tube and comprising, in combination, a container, a depositing element, a duct connectingsaid container and element, a reciprocatory pump element adapted to force a coating material from the container to the depositing element, an oscillatory element adapted to lreciprocate said pump element, a brush capable of limited movement relative to said pump mechanism, and a member adapted to be shifted by contact with said brush for oscillating said oscillatory element.

1-7. In a tube coating machine, the combination with apparatus adapted to be passed through a tube, of mechanism for reciprocating said apparatus in the tube, and mechanism associated with said apparatus whereby said reciprocation effects the deposit upon the surface of the tube of a coating material and the spreading of said material over the said surface.

'18. In a tube coating machine, apparatus adapted to be passed through a tube and comprising mechanism' for distributing a. coating material over the surface of said tube, and mechanism for advancing the said apparatus-through the tube in a series of recip'rocatory steps, the forward movement of Mill - bination with an apparatus adaptedto be l.movement thereof, said advancing mechanism comprising a shaft at each end of said tube, a .sprocket on each of said shafts, a sprocket chain mounted on said sprockets and having the ends thereof attached to opposite ends of said distributing apparatus, a pair of ratchet wheels adapted by means of oscillating pawls to rotate the said shafts alternately in different directions, one of said ratchets being of greater diameter than the other whereby the said oscillations of the shafts are greater in one direction thanin the other, and mechanism for oscillating said pawls. i

20. .In a tube coating machine, the combination with a pair of frames adapted to be supported in the opposite ends of the tubes of a boiler, each of said frames supporting a shaft having thereon a sprocket, of apparatus adapted to be drawn through said tubes for distributing a coating material on the interior surfaces thereof, a chain upon said sprockets, the ends 'of which chain are attached to the opposite ends of said distributing apparatus, and mechanism carried by one of said frames for rotating the sprockets to cause the drawing of said distributing `apparatus through one of the tubes, one of said frames comprising means for retaining .the said chain under a constant tension.

21. In a tube coating machine, the combination with apparatus adapted to be passed through a tube for distributing a coating material on the interior thereof, of mechanism including a sprocket at each end of said tube and a chain mounted on said sprocket andhaving its ends attachedto opposite ends of said apparatus, a driving element for said sprockets, and means attached to said chain for discontinuing the operation of said driving element when the said distributing apparatus has reached the forward end of the tube.

. 22. In a tube coating machine, thecombination with apparatus adapted to be passed through a tube for distributing a coating material over the inner surface thereof, of mechanism for drawing said apparatus through the tube, and means associated with said mechanism for directing a draft of air through the said coated tubes.

23. In a tube coating machine, apparatus adapted'to be passedthrough a tube and comprising, in combination, a container, a rotary depositing element, means for delivering coating material from the container to the depositing element, and mechanism for 4rotating said element for effecting the depositing of the contained material upon the walls of the tube.

124. In a tube coating machine, apparatus chine of a brush; mechanism' for automatically applying a coating material to said brush; and mechanism for reciprocating the brush and at the same time progressing it through the tube.

26. The combination in a tube coating machineof a brush formed to frictionally engage the inside surface of a tube; a reservoir for coating material mounted to move relativel to the brush.; a pump having its cylin er and plun er respectively connected to the brush an to the reservoir; with means for reciprocating the brush in a tube to cause the pump to deliver the coating liquid from the reservoir to the tube.

27. The combination in a tube coating machine of a brush formed to frictionally engage the inside surface of a tube; a reservoir for coating material mounted to move relativel to the brush; a pump having its cylin er and plunger respectively connected to the brush and to the reservoir; means for reciprocating the brush in a tube to cause the pump to deliver the coating liquid'from the reservoir to the tube; with means for longitudinally progressing the brush and reservoir as a unit through the tube.

28. The combination in a tube coating machine of a brush formed to frictionally engage the inside surface of a tube; a reservoir for coating material mounted to move relativly to the brush; a pump having its cylinder and plunger respectively connected to the brush and to the reservoir; means for reciprocating the brush in the tube to cause the pump to deliver the coating liquid from the reservoir to the tube; with means for rotating the brush as it is moved in the tube.

29. rllhe combination in a tube coating ma-` pump and Lemme ,l chine of at least one brush formed' oper- I ate on the inside surface of a tube; a reservoir; a pump; adevice for depositing on the inside surface of a tube the coating material drawn from the reservoir by the pump; means for causing the pump to be actuated by relative movement'of the brush and one of the pump members; and mechanism for reciprocating the brush with the pump and depositing device in a tube and progressing ,said apparatus through the tube.

31. In combination, a brush shaped to engage-the inside of a tube,.means for pulling said brush through said tube, and means forv automatically depositing material in ady Vance of'sald brush in quantities proportional to theprogress 'of said'brush through the tube.

32. In combination, a brush shaped to engage the inside of a tube, means for pulling both said means over a surface to be coated, and feed means actuated b said movement for producing a flow o said applying means, whereby said How is proportional to the rate of progress of the device over the surface.

PHILIP BELLUWS.

applying means, 'spreadmg means, .mechanism for moving 

